The effects using colour from gradient and the stroke (just make sure the fade length matches the path or the reference circle) can be enhanced by a bit of a curve adjustment to make it pop a bit more:
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For reference, here is the dynamic settings I used for that 100px long stroke:
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And as another tip, after baking the white to black gradient stroke, just use Layer->Transparency->Colour to Alpha to turn the white transparent (rather than setting the layer mode to multiply), lock the layer's alpha channel, then fill the layer with any colour you want to get a coloured fade:
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-Rob A>